JPS6339442Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] In a magnetic disk device used as an external storage device for an information processing device, the quality test of a magnetic head that records/reproduces information on a magnetic recording medium is performed using a magnetic This is done by fixing the head to a test device and actually recording/reproducing information on a magnetic recording medium. The present invention relates to a device for fixing a workpiece such as a magnetic head arm when testing a magnetic head or the like.

[Conventional technology]

FIG. 3A is a plan view of the magnetic head driving device, and FIG. A magnetic head arm 1 has a magnetic head 2 attached and supported at its tip. This magnetic head arm 1 has a drive shaft 3
It is fixed to an arm support 4 fixed to. For this fixing, a positioning surface A in the tangential direction of the drive shaft 3 and a positioning surface B in the perpendicular direction to the positioning surface A are provided.
and a positioning surface C that defines the vertical position of the magnetic head arm 1. Further, the magnetic head arm 1 has a rectangular mounting hole 5 formed between the positioning surfaces A and B, into which a fixed head 6a at the tip of the fixed arm 6 is fitted. The threaded rod 6c integrated with the fixed arm 6 is
A nut 7 is threaded through the hole 4a of the arm support 4.

The threaded rod 6c forms a certain angle (for example, 45 degrees) with the positioning surfaces A and B, and the side 5a of the mounting hole 5 perpendicular to the threaded rod 6c is inclined at 45 degrees. Therefore, when the nut 7 is tightened with the fixed head 6a inserted into the hole 5, the inclined surface 6b of the fixed head 6a will align with the inclined surface 5 of the mounting hole 5.
a is pressed, and the magnetic head arm 1 is pressed in the direction of the positioning surfaces A, B, and C. That is, by simply tightening one fixing arm 6, positioning and fixing in three directions can be achieved. With the magnetic head arm 1 fixed to the arm support 4 in this way, the magnetic disk 8 is rotated in the direction of arrow _a1 , and the magnetic head arm 1 is rotated by the drive shaft 3, so that the magnetic head 2 is moved to a predetermined track. Seeked.

[Problem that the invention attempts to solve]

The quality test of the magnetic head 2 is performed by causing the magnetic disk 8 to seek the magnetic head 2 while the magnetic head 2 is mounted on the magnetic head arm 1. Therefore, the test device also needs to be able to temporarily fix the magnetic head arm 1. Moreover, the product magnetic head arm 1 must be fixed in its current state so that it can be easily attached and detached.

The technical problem of the present invention is to realize a device that satisfies these requirements for a fixing device and that allows a workpiece such as a magnetic head arm to be easily attached to and detached from a test device.

[Means for solving problems]

The technical means of the present invention taken to solve this problem is to attach a workpiece, which is an article to be fixed, in which an inclined surface is formed on the inner wall of at least a part of a mounting hole drilled in the workpiece, to an arm support. In the device for fixing to the mounting hole, a fixing arm having a presser part that presses the inclined surface at a position corresponding to the inclined surface of the mounting hole is fixed to the mounting hole, and the fixing arm is fixed to the mounting hole so that the fixing arm is not rotatable but can be reciprocated in the axial direction of the fixing arm. The arm support and the holding means are provided with a through hole in the axial direction of the fixed arm, through which a tightening bolt is inserted, so that the arm support is rotatable and axially one end of the connecting member disposed between the fixing arm and the tightening bolt is pivotally supported on the base end of the fixing arm by a horizontal axis, and the other end of the connecting member is supported so as not to be movable in the center direction; is screwed together with the tip of the tightening bolt, and the holding means through which the tightening bolt is inserted is extended to the upper side of the fixed arm so as to be able to press the upper surface of the fixed arm, and the tightening bolt and the holding means The structure requires each of the following requirements: 1. A means for fixing the bolt to the tightening bolt insertion portion;

[Effect]

According to this technical means, a set screw or the like is suitable as the removable connection means, and when the set screw is loosened, the tightening bolt can be rotated independently of the holding member. When the tightening bolt is rotated, the fixed arm moves back and forth together with the connecting member, but at this time, since the fixed arm cannot rotate around its axis, the fixed arm only moves back and forth. The fixed arm is supported by a horizontal shaft on a connecting member threaded with a tightening bolt, so
The fixed arm can rotate up and down about the horizontal axis. That is, the holding portion at the tip of the fixed arm can be attached to and removed from the inclined surface of the mounting hole of the workpiece from above. However, when the holding tool is rotated around the axis of the tightening bolt to the top of the holding tool and presses down on the fixed arm, the holding tool cannot be lifted up.

To fix the workpiece, loosen the setscrew and separate the holding tool from the tightening bolt, then set the workpiece, fit the fixing arm into the mounting hole of the workpiece, and operate the tightening bolt. , press the holding part of the fixed arm against the inclined surface of the mounting hole. In this state, turn the presser to the top of the fixed arm so that the fixed arm cannot rise, and at this point fix the presser to the tightening bolt with a set screw. Next, when the tightening bolt is turned in the loosening direction, the presser retracts from above the fixed arm to the side, which loosens the fixed arm and rotates the fixed arm upward, making it possible to remove the workpiece that has been tested. From next time onwards, simply set the workpiece, press the fixed arm onto the workpiece, and turn the tightening bolt in the tightening direction.The fixed arm will be pressed onto the workpiece, and the holding tool will press the fixed arm against it.

〔Example〕

Next, how the fixing device according to the present invention is actually implemented will be explained using examples. FIG. 1 shows an embodiment in which the present invention is applied to fixing a magnetic head arm, in which A is a plan view, B is a sectional view taken along the line L--RO in FIG. Reference numeral 1 denotes a magnetic head arm, which is fixed to an arm support 4 of the testing device. The arm support 4 of the test device also has three positioning surfaces A, B, and C, just like the arm support 4 of the magnetic disk device shown in FIG.
A fixed arm 8 has a holding portion 8a at its tip that fits into the mounting hole 5 and presses the inclined surface 5a, and its base end is rotatably supported by a connecting rod 10 through a horizontal shaft 9. . A horizontal support hole 11 is formed in the arm support 4, and a tightening bolt 12 is inserted and supported in the support hole 11. The inner end of the tightening bolt 12, that is, the end on the connecting rod 10 side, is screwed into a female thread formed in the connecting rod 10. A knob 12 a is formed at the outer end of the tightening bolt 12 , that is, at the tip of the portion outside the support hole 11 . Reference numeral 13 denotes a presser that extends from the knob 12a side onto the fixed arm 8, and has a presser portion 13a at the tip.
It is equipped with the following. The clamping bolt 12 is inserted into the base of the clamping tool 13 on the outside of the support hole 11, so that the clamping tool 13 is supported by the clamping bolt 12. By tightening the setscrew 14 screwed into the base end of the presser 13, the presser 13 is fixed to the tightening bolt 12 and can be rotated together. With this configuration, when the tightening bolt 12 is operated, the fixed arm 8 moves in the direction of arrow a ₂
Although the fixed arm 8 can be moved back and forth in the direction, a pin 15 installed perpendicularly to the arm support 4 is attached to the fixed arm 8 so that the fixed arm 8 and the connecting rod 10 do not rotate at that time.
It fits into a groove 8c formed on the lower surface of the. Further, a compression coil spring 17 is inserted between the lower end of the pin 15 and the bottom of the pin support hole 16 so that the fixed arm 8 can be pushed up by the pin 15.

Now, in order to fix the magnetic head arm 8 with this device, first loosen the set screw 14 and remove the retainer 13.
is rotated and retracted to the side of the fixed arm 8, as shown by the chain line in Figure C. Then fixed arm 8
is pushed up via the pin 15 by the spring force of the compression coil spring 16, and rotates upward around the shaft 9. In this state, the magnetic head arm 1, which is a workpiece, is set, and then the fixed arm 8 is pushed down to fit the holding portion 8a at the tip into the mounting hole 5. Then, as shown by the solid line in Figure C, the presser 13
Rotate it to the top of the fixed arm 8, and
prevent the rotation from increasing. In this state, the tightening bolt 12 is tightened by operating the knob 12a. Then, tighten the connecting rod 10 with the tightening bolt 12.
The fixed arm 8 is pulled in the direction of arrow _a2 through the magnetic head arm 1, and the holding part 8a at the tip of the fixed arm is pressed against the inclined surface 5a of the mounting hole of the magnetic head arm 1, as in the case of the product shown in Fig. 3. The magnetic head arm 1 is pressed in three directions on the positioning surfaces A, B, and C, and the magnetic head arm 1 is accurately positioned and fixed to the arm support 4 of the test apparatus. In the sufficiently tightened state, the set screw 14 is tightened to fix the presser 13 to the tightening bolt 12.

In this state, the characteristics of the magnetic head supported at the tip of the magnetic head arm are tested to determine whether it is good or bad.
After the test, when the knob 12a is loosened, the presser 13 also rotates and is retracted to the side as shown by the chain line in Figure C. Then, the tightening bolt 12 also loosens to some extent, and the holding part 8a of the fixed arm 8 is released from the inclined surface 5a of the mounting hole, and the fixed arm 8
The magnetic head arm 1 is pushed up by the spring force of the compression coil spring 17 and rotates upward around the support shaft 9. Therefore, the magnetic head arm 1 that has been tested is removed, the next magnetic head arm 1 is set, and the fixed arm 8 is inserted into its mounting hole 5. At the same time, use the knob 12a to insert the presser 13 into the fixing arm 8.
Rotate it to the top so that the fixed arm 8 does not rotate upward. The rotation at this time also slightly tightens the tightening bolt 12, and the inclined surface 5a of the magnetic head arm is reliably pressed.

Therefore, only when fixing the first magnetic head arm 1, loosen the setscrew 14 and tighten the retainer 13.
It is sufficient to simply tighten the fixed arm 8 while the arm is free, then turn the presser 13 onto the fixed arm 8 and tighten the set screw 14. Thereafter, as long as magnetic head arms of the same size are fixed, there is no need to attach or detach the setscrew 14, and the magnetic head arm 1 can be tightened/removed by just one-touch operation of the knob 12a.

FIG. 2 shows another embodiment of the present invention, in which A is a plan view and B is a cross-sectional view of FIG. A holding plate 18 extending above the tip of the holding tool 13 is fixed to the shaft 3 for rotationally driving the magnetic head arm 1,
This prevents the presser 13 from lifting up when the presser 13 is turned onto the fixed arm 8 to press the fixed arm 8.

[Effect of idea]

As described above, according to the present invention, once the magnetic head arm that serves as the workpiece is fixed, the workpiece can be fixed and removed with a single touch as long as the workpiece is of the same size. It is extremely effective for temporarily fixing. In addition, the fixing device is small and the fixing arm can be attached and detached from above, and there is no need to install special parts above the fixing arm, etc., so it does not interfere with magnetic disks, etc. and can be tested in the same condition as the product. It can be performed.

[Brief explanation of the drawing]

Fig. 1 is a plan view and a cross-sectional view showing an embodiment of the fixing device according to the present invention, Fig. 2 is a plan view and a longitudinal sectional view showing another embodiment of the present invention, and Fig. 3 is a product produced by assembling the workpiece. FIG. In the figure, 1 is a magnetic head arm, 4 is an arm support, 5 is a mounting hole, 5a is an inclined surface, 8 is a fixed arm, 8a is a holding part, 10 is a connecting rod, 1
2 is a tightening bolt, 13 is a presser, 14 is a set screw, 15 is a rotation stopper pin, and 17 is a compression coil spring, respectively.

Claims (1)

[Claims for Utility Model Registration] A device for fixing a workpiece to an arm support body, in which at least a part of the inner wall of a mounting hole drilled in the workpiece, which is an article to be fixed, has an inclined surface, the mounting hole a fixed arm having a pressing portion that presses the inclined surface at a position corresponding to the inclined surface of the fixed arm is disposed on the arm support so as to be non-rotatable but movable back and forth in the axial direction of the fixed arm; A through hole in the axial direction of the fixed arm is provided in the arm support and the pressing means, and a tightening bolt is inserted through the hole, so that the arm support is rotatably supported but not movable in the axial direction. , one end of a connecting member disposed between the fixed arm and the tightening bolt is pivotally supported by a base end of the fixed arm with a horizontal shaft, and the other end of the connecting member is screwed with the tip of the tightening bolt. The holding means through which the tightening bolt is inserted is extended to the upper side of the fixed arm so that the upper surface of the fixed arm can be pressed, and the holding means is fixed between the tightening bolt and the tightening bolt insertion part of the holding means. A positioning and fixing device that requires each of the following: